Medicare Advantage

Medicare Advantage, formally Medicare Part C, is the private alternative to original Medicare. Instead of the federal government paying your hospitals and doctors directly, a private insurer receives a monthly payment from Medicare and takes over your coverage, bundling hospital and medical benefits, usually drug coverage, and often dental, vision, and fitness extras into a single plan.

The option has grown from a niche into the default. In 2026, 55 percent of eligible Medicare beneficiaries, 35.2 million people, are enrolled in Medicare Advantage plans, up from about 25 percent in 2010 ¹. The market is concentrated: UnitedHealthcare and Humana together account for 46 percent of enrollment nationally ¹.

The pitch is real (lower premiums, an out-of-pocket cap, extra benefits), and so are the strings attached (provider networks, prior authorization, and a switch back to original Medicare that gets harder with time). Neither side of that ledger shows up clearly in television ads, so this article lays out both.

How it differs from original Medicare#

Medicare Advantage plans must cover everything Parts A and B cover, and enrollees keep paying the Part B premium. From there the two systems diverge ².

Most plans are HMOs or PPOs. HMOs generally cover only in-network care except in emergencies; PPOs cover out-of-network care at higher cost. Special needs plans (SNPs), which serve people with specific chronic conditions or those with both Medicare and Medicaid, now account for 23 percent of Medicare Advantage enrollment and most of its recent growth ¹.

Sources for this section: [1] [2] [3]

Networks and prior authorization#

The core trade in Medicare Advantage is flexibility for cost control. Plans manage spending by limiting which providers you can use and by requiring advance approval, called prior authorization, before they pay for certain care. Plans commonly apply it to higher-cost services such as advanced imaging, some procedures and drugs, and post-hospital stays in a skilled nursing facility (the setting covered in nursing homes).

The scale is worth understanding. Medicare Advantage insurers processed nearly 53 million prior authorization requests in 2024 and denied 4.1 million of them in whole or in part, a 7.7 percent denial rate ⁴. Traditional Medicare, by contrast, requires prior authorization for only a short list of services and completed about 625,000 reviews in fiscal year 2024, roughly two per 100 beneficiaries versus 1.7 requests per Medicare Advantage enrollee ⁴.

Two other numbers matter more for anyone facing a denial: only 11.5 percent of denied requests were appealed in 2024, but 80.7 percent of those appeals succeeded in reversing the denial partly or fully ⁴. In other words, most denials go unchallenged, yet most challenges win. Appealing, with help from your doctor's office, is usually worth the paperwork, and every denial notice must explain how.

Networks deserve the same scrutiny before you enroll as after. Provider directories go stale, doctors leave networks midyear, and a plan that includes your primary care physician may not include the oncologist or hospital you would want in a bad year. Confirm participation with the provider's billing office directly rather than relying on the plan's directory alone.

Sources for this section: [4]

Extra benefits and their limits#

Extra benefits are Medicare Advantage's most advertised feature, and they are nearly universal: in 2026, more than 99 percent of enrollees in individual plans are in plans offering some vision benefit, 98 percent dental, 95 percent hearing, and 91 percent a fitness benefit ³. Some plans, particularly SNPs, add transportation to medical appointments, allowances for over-the-counter items, or meal deliveries after a hospital stay.

The fine print determines what these are worth. Dental benefits often cover cleanings and X-rays but cap the plan's total annual payment for major work such as crowns, dentures, or implants, and they require the plan's dental network. Vision benefits typically mean an exam and a fixed eyewear allowance. Hearing benefits usually offer set copays on a limited selection of hearing aids. "Up to" figures in advertising describe ceilings, not typical experience. Dental, vision, and hearing coverage compares these benefits with standalone alternatives in detail.

For anyone choosing a plan because of a specific extra, the practical test is simple: find the benefit's dollar cap, its network, and its cost-sharing in the plan's Evidence of Coverage document, then judge whether the real value beats what you would pay out of pocket.

Sources for this section: [3]

What Medicare Advantage costs#

Two-thirds of Medicare Advantage plans that include drug coverage (67 percent) charge no premium at all beyond the Part B premium in 2026 ³. Everyone still pays Part B itself, $202.90 a month for most people in 2026 ⁵, and zero-premium does not mean zero-cost: plans charge copays and coinsurance as you use care, so a healthy year can be very cheap and a sick year expensive.

The backstop is the out-of-pocket maximum, a feature original Medicare lacks. Federal rules cap in-network out-of-pocket spending at $9,250 in 2026 (and $13,900 including out-of-network care in PPOs), but plans can and do set lower limits; the average in-network limit is $5,421 in 2026, lower in HMOs ($4,636) than PPOs ($6,592) ³. Prescription drugs do not count toward that medical cap; they fall under Part D's separate $2,100 out-of-pocket limit in 2026.

A fair comparison with original Medicare therefore depends on your health and your alternative. Against original Medicare alone, Medicare Advantage adds a safety cap. Against original Medicare with a Medigap policy, it trades higher possible out-of-pocket costs for lower fixed premiums.

Sources for this section: [3] [5]

Star ratings#

Medicare scores every plan each fall on a five-star scale, combining dozens of measures: preventive care rates, management of chronic conditions, member complaints and appeals, customer service, and drug safety. Ratings appear in the Plan Finder, and plans rated four stars or higher earn federal bonus payments. For 2026, about 64 percent of Medicare Advantage enrollees in plans with drug coverage are in contracts rated four stars or better ⁶.

Stars are a useful screen but a blunt one. Ratings apply to entire contracts that can span many states, so they may not reflect the plan's network or service where you live, and a high rating says nothing about whether your doctors participate. Consistently low ratings are the clearer signal; Medicare can terminate plans that stay below three stars for years. A rating of five stars carries one practical perk: a special window to switch into such a plan outside normal enrollment periods.

Sources for this section: [6]

Switching plans and the Medigap trap#

You can change Medicare Advantage plans, or leave for original Medicare, during the fall open enrollment period (October 15 to December 7) and, if you are already in a plan, make one switch during the Medicare Advantage open enrollment period (January 1 to March 31). Medicare enrollment periods covers the mechanics.

The asymmetry people miss is Medigap. Leaving Medicare Advantage returns you to original Medicare, with its unlimited 20 percent coinsurance, and buying a Medigap policy to cover that exposure is only guaranteed in narrow circumstances. Federal law gives you a "trial right" if you joined a Medicare Advantage plan when you first became eligible at 65 and leave within 12 months, and protections apply if your plan shuts down or leaves your area ⁷. Outside those situations, insurers in most states can underwrite: review your health history, charge more, or refuse to sell you a policy at all. Connecticut and New York require year-round acceptance, and some states allow annual switching under birthday rules, but most do not ⁷.

Note: Treat the first year in Medicare Advantage as the test drive. After the trial right expires, developing a serious condition can mean the choice is no longer fully yours to reverse, because Medigap underwriting in most states considers your health.

Sources for this section: [7]

How to compare plans#

The honest way to shop is the Medicare Plan Finder at medicare.gov, which lists every plan in your ZIP code. Enter your actual medications and preferred pharmacies, and sort by estimated total yearly cost (premiums plus drug costs) rather than premium alone. Then, for the finalists, check four things the ads never mention: whether each of your doctors and preferred hospitals is in network, the out-of-pocket maximum, cost-sharing for the services you use most (specialist visits, imaging, hospital days), and the star rating.

Free, unbiased help exists. Every state's SHIP program offers one-on-one counseling from trained volunteers who sell nothing; call 877-839-2675 or visit shiphelp.org, or call 1-800-MEDICARE (1-800-633-4227). Insurance agents and brokers can also enroll you at no charge to you, but they are paid commissions by the plans and may not represent every plan in your area, so their menu is not always the full one. However you shop, redo the comparison each fall: plans change networks, drug lists, and benefits every January, and the plan that fit you at 65 may not be the one that fits at 75.

RetiredWiki. (2026, July 6). Medicare Advantage. https://retiredwiki.com/article/medicare-advantage